Vidmenir Knume, known as Knu, is a nonhuman native of the planet Vidknu, which remains unaligned with the Interstellar Treaty Alliance. His species features scaly skin and a notably tall, human-like stature.

Knu underwent a unique developmental process inherent to his species: born without sexual differentiation, individuals remain genderless until puberty, when natural hormonal secretions determine their permanent sex. Knu developed into a male through this process. This aspect of his biology becomes narratively significant when he identifies another character, Frolbericheri Frol, as a "menir." This term, meaning "angel" in his culture, specifically denotes individuals in the pre-sexual differentiation state.

Culturally, Knu adheres to Vidknu traditions, viewing the group's encounter with a blue sun as a "bad omen," reflecting his society's focus on fate and cosmic signs. His demeanor is consistently calm and logical, establishing him as a voice of reason within the group. He actively contributes to problem-solving and frequently mediates conflicts or clarifies misunderstandings stemming from interspecies differences.

Following the events aboard the derelict spaceship, Knu pursued a career as a poet. His popular poetry collection, "Summer of the Menir," stands as a significant cultural work.